Chrome: If you're tired of previewing only sparse links like YouTube or Twitpic on Twitter.com, Embedly's browser extension saves you from opening a flood of new tabs by integrating the most common sites right into Twitter.

Embedly's Parrotfish lets you enjoy a far range of support for sites like Tumblr, Last.fm, Picasa, and even Hulu all from within Twitter. Music and videos are encoded, on the fly, for HTML5 playback, and audio support is embedded for better song previewing. The extension also scans inbound links for potential malware so you don't have to worry about safety.